Lithium secondary battery
US-2022190379-A1 · Jun 16, 2022 · US
Lithium iron complex oxide, cathode material, cathode, and lithium-ion secondary battery
US12412902B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12412902-B2 |
| Application number | US-202217913739-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jan 7, 2022 |
| Priority date | Jan 8, 2021 |
| Publication date | Sep 9, 2025 |
| Grant date | Sep 9, 2025 |
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Abstract
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A lithium iron complex oxide is represented by Li 5 FeO 4 , two peaks with different quadrupole splitting values (QS) analyzed using 57 Fe Mössbauer spectroscopy are shown, one of the two peaks, a peak A, satisfies QS>0, and the other one of the two peaks, a peak B, satisfies QS=0.
First claim
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What is claimed is: 1. A lithium iron complex oxide, wherein the lithium iron complex oxide is represented by Li 5 FeO 4 , two peaks with different quadrupole splitting values (QS) analyzed using 57 Fe Mössbauer spectroscopy are shown, one of the two peaks, a peak A, satisfies QS>0, and the other one of the two peaks, a peak B, satisfies QS=0. 2. The lithium iron complex oxide according to claim 1 , wherein the peak A and the peak B have an isomer shift value (IS) of 0.05 or more and 0.25 or less, respectively. 3. The lithium iron complex oxide according to claim 1 , wherein when an area value of the peak A is S A and an area value of the peak B is S B , 0.01≤S B /(S A +S B )≤0.50 is satisfied. 4. A cathode material containing the lithium iron complex oxide according to claim 1 . 5. A cathode material containing the lithium iron complex oxide according to claim 1 , and a coating layer which coats a surface of the lithium iron complex oxide, wherein the coating layer contains lithium silicate. 6. The cathode material according to claim 5 , wherein a mass ratio of the coating layer is 0.1% by mass or more and 3.0% by mass or less with respect to the entire cathode material. 7. A cathode material containing the lithium iron complex oxide according to claim 1 , and a coating layer which coats a surface of the lithium iron complex oxide, wherein the coating layer contains diamond-like carbon. 8. The cathode material according to claim 7 , wherein in Raman spectrum analysis of the coating layer, a spectrum of a G band of 1580 cm −1 and a spectrum of a D band of 1350 cm −1 partially overlap each other, and a G/D ratio, which is a ratio of peak intensities of the G band to the D band, is 1.5 or less. 9. A cathode containing the cathode material according to claim 4 . 10. A lithium-ion secondary battery comprising: the cathode according to claim 9 .
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Classifications
Positive electrodes · CPC title
Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title
of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title
Electric properties · CPC title
one phase coated with the other · CPC title
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- What does patent US12412902B2 cover?
- A lithium iron complex oxide is represented by Li 5 FeO 4 , two peaks with different quadrupole splitting values (QS) analyzed using 57 Fe Mössbauer spectroscopy are shown, one of the two peaks, a peak A, satisfies QS>0, and the other one of the two peaks, a peak B, satisfies QS=0.
- Who is the assignee on this patent?
- Tdk Corp
- What technology area does this patent fall under?
- Primary CPC classification C01G49/0027. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Sep 09 2025 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 6 related publications on this page (citations in our corpus or others sharing the same primary CPC).